class_docstr: Wraps a variable source to add a pre-defined prefix to all names.
code: def __init__(self, source: core.VariableSource, prefix: str):
      self._source = source
      self._prefix = prefix
  
imports: from typing import Dict, Iterator, List, Mapping, Optional, Sequence
  from acme import adders
  from acme import core
  from acme import specs
  from acme import types
  from acme.agents.jax import builders
  from acme.agents.jax.multiagent.decentralized import actor
  from acme.agents.jax.multiagent.decentralized import factories
  from acme.agents.jax.multiagent.decentralized import learner_set
  from acme.jax import networks
  from acme.multiagent import types
  from acme.multiagent import utils
  from acme.utils import counting
  from acme.utils import iterator_utils
  from acme.utils import loggers
  import jax
  import reverb
label_desc: Use image node_id 1 to create a new PrefixedVariableSource object from inherited base classes: core with example: obj = PrefixedVariableSource(source, prefix)